It is caused by the death of nerve cells in a midbrain area called substantia nigra. 它是由于中脑塞梅林氏神经节中的神经细胞死亡导致的。
Despite the fact that all are nerve cells, only the retinal ganglion cells and few amacrine cells create action potentials. 虽然这些细胞都属于神经细胞，但是只有神经节细胞和少数无长突细胞产生动作电位。
